<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">

function show(){
	var a = 10;
	function show2(){
		var c = 10;
		var c = 10;
		var c = 10;
		var c = 10;
		var c = 10;
		var c = 10;
	//	alert(a);
	}
	show2();
	alert(c);
};
show();
</script>
</body>
</html>